Add files support

[gberche-orange]

• As a service author abusing the generic-scripting-release to automate some processing,
• in order
  • to manage scripts that spawn many lines
  • to produce files such as cf manifest.yml without the shell scripting and escaping burden
• I need the generic-scripting-release to support files such as:

properties:
  scripting.files
description: a set of files that would be written to file system
example: |
   files:
     - path: "sample.yml"
       content: "martin: {name: Martin Developer, job: Developer, skill: Elite}"
       permissions: "444"
     - path: "registerBroker.bash"
       content: |
           #!/bin/bash
           cf service-brokers
           cf help -a
       permissions: "555"